Image enlargement method based on bilateral quadratic b-spline interpolation without offset

A spline interpolation and image technology, which is applied in the field of image enlargement based on bilateral quadratic B-spline interpolation without offset, can solve the problems of large amount of calculation, blurred enlarged image, and vibration of image signal, so as to save calculation amount, The effect of reducing shock

Inactive Publication Date: 2015-12-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, several commonly used algorithms of this type also have obvious defects.
The bilinear interpolation algorithm causes the enlarged image to be blurred, and the cubic kernel function interpolation algorithm will cause large fluctuations in the image signal, and the calculation amount is relatively large

Method used

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  • Image enlargement method based on bilateral quadratic b-spline interpolation without offset
  • Image enlargement method based on bilateral quadratic b-spline interpolation without offset
  • Image enlargement method based on bilateral quadratic b-spline interpolation without offset

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Embodiment Construction

[0029] Such as figure 1 As shown, the implementation steps of the image enlargement method based on the bilateral quadratic B-spline interpolation without offset in this embodiment are as follows:

[0030] (1) Select a part of the original image as the target image, and determine the number of pixels in the target image according to the size and magnification of the original image.

[0031] (2) For a target pixel of the target image, determine its coordinates in the original image, and then divide the coordinates of the target pixel by the magnification of the original image to obtain the target floating point coordinates.

[0032] (3) if figure 2 As shown in , the 4×4 pixels in the original image whose horizontal and vertical coordinates are closest to the position are selected as the sampling points for interpolation. According to the target floating-point coordinates obtained in step (2), select two columns of pixels on the left and right of the coordinates and two rows ...

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Abstract

The invention discloses an image magnification method on the basis of zero-offset bilateral quadratic B-spline interpolation. The image magnification method includes determining the quantity of pixels of a target image according to the size of an original image and a magnification factor; determining the position of a target pixel point of the target image in the original image; selectively using NXN pixels with the shortest distances to the position in the original image as interpolation sampling points; respectively substituting the distances from the sampling points to the target pixel in the same direction into a kernel function to compute weights, and acquiring an interpolation result for N sampling points in each row or column; and utilizing the N interpolation results as sampling points, and respectively substituting vertical distances from the various sampling points to the position of the target pixel into the kernel function to compute weights, and acquiring a final result which is a pixel value of the target pixel point by means of interpolation to complete magnifying the image. The image magnification method has the advantages that the computational efficiency can be improved while the perfect interpolation magnification result is acquired, and oscillation of image signals is reduced.

Description

technical field [0001] The invention relates to the technical fields of digital image processing and computer vision, in particular to an image enlargement method based on non-offset bilateral quadratic B-spline interpolation. Background technique [0002] With the continuous promotion of digital applications, digital image information plays an increasingly important role in social production and life. There is an increasing demand for high-quality images in the fields of visualization technology research, medical treatment, aerospace, and digital entertainment. With the diversification of image display devices and the continuous increase in size, the demand for high-resolution images has become more urgent. However, the current high-resolution digital image acquisition equipment and network transmission support are still far behind the demand. Therefore, the method of enlarging low-resolution images has become more and more important, and has always been a research hotspot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40
Inventor 冯结青谢富续
Owner ZHEJIANG UNIV
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